/*
 *  Java OTR library
 *  Copyright (C) 2008-2009  Ian Goldberg, Muhaimeen Ashraf, Andrew Chung,
 *                           Can Tang
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of version 2.1 of the GNU Lesser General
 *  Public License as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package ca.uwaterloo.crysp.otr.crypt;

/**
 * The HMAC digital signature algorithm.
 * 
 * @author Can Tang <c24tang@gmail.com>
 */
public abstract class HMAC extends AbstractMAC{
        
        public final String getAlgorithm() {
                return "HMAC";
        }

        public String toString() {
                String output = new String();
                if (key == null) {
                        output="Key uninitialized";
                } else {
                        // Print public + private key info
                        output="Secret Key: "+key.toString()+"\n";

                }

                return output;
        }
        
        public abstract byte[] doFinal() throws OTRCryptException;
}
